Portable road roller



Aug. 29, 1939. R. w KEELER PORTABLE ROAD ROLLER Filed July 2'7, 1935 8 Sheets-Sheet l [/Vl/f/VTOP. QAYMOND W. KEELEQ ATT'Y.

g- 29, 1939- R. w. KEELER 2,171,255

PORTABLE ROAD ROLLER Filed- July 27, 1935 8,Sheets-Sheet 2 f/VVf/VTOEI QAYMOND W. KEELEE,

Aug. 29, 1939. KEELER 2,171,255

PORTABLE ROAD ROLLER Fild July 27, 1935 8 Sheets-Sheet 3 Q [so m fA/l f/VTOQ:

QAYMOND W. K5152,

MIM

Aug. 29, 1939. w KEELER 2,171,255

PORTABLE ROAD ROLLER 4 Filed July 27, 1935 8 Sheets-Sheet 4 PAYMOND W. KEELEE,

Aug. 29, 1939. R. w. KEELER 2,171,255

PORTABLE ROAD ROLLER Filed July 27, 19:55 -8 Sheets-Sheet 5 f/vl/f/vra/a" V PAYMOND W. KEELEQ, BY v fld g 771, 77M

ATTY

Aug. 29, 1939.

R. W. KEELER PORTABLE ROAD ROLLER Filed July 27, 1955 8 Sheets-Sheet 6 himl K mm MK W D N Ml O a W A 5 E 4 2 mm ,0 m 0 mm l 2: 4 2m a a) In a K ma z i GL/L 2 77 g- 29, 1939- R. W.KEELER 2,171,255

PORTABLE ROAD ROLLER Patented Aug. 29, 1939 PATENT OFFICE PORTABLE RoAn ROLLER Raymond W. Keeler, Galion, Ohio, assignor to Galion Iron Works & Manufacturing Company, a corporation of Ohio Application July 27, 1935, Serial No. 33,543

27 Claims.

My invention relates to portable road rollers and is particularly adapted for operation on patches or repair of prew'ously built roads, but in addition to rolling patch material it may have a general application for compacting loose ma-- terial, rolling drives, lawns, etc.

One of the objects of the present invention is the provision of a self-contained power-operated roller which may be readily adapted to. a haulin vehicle, such as a truck, and the roller raised up off the ground to enable the truck to transport the road roller fromplace to place at truck speed.

Another object of the invention is the provision in a self-contained power-operated roller, of reversing mechanism so connected to a clutch between the engine and the power transmission mechanism that whenever the reversing gearing is moved to neutral position the clutch will be released, without interfering with the normal operation of applying and releasing the clutch when the reversing gearing is in either of its transmission positions.

A further object of the invention is the provision in a self-contained power-operated road roller, of a single lever movable longitudinally of the machine for controlling the reversing gearing and operating the clutch.

Another object of the invention is the provision of tiltably mounting the rear axle of a road roller to permit one of the rear wheels to ride along a curb while the roller operates along the gutter of a roadway.

A still further object of the invention is the provision of improved and eiiicient mechanism for adjusting the relative positions of a vehicle unit and a roller unit, to enable the vehicle unit to be hitched to a hauling vehicle while the roller llinit is lifted ofi the roadway for fast transporta- A further object of the invention is the provision of improved and eflicient fluid-pressure mechanism for adjusting a road roller unit relative to a vehicle frame.

Another object of the invention is the provision in a self-contained power-operated roller, of means operable from the operator's station for flowing liquid onto the rolling surface of the roller.

A further object of the invention is the pro- 50 vision of improved mechanism for hitching the road roller to a hauling vehicle and locking the rear steering wheels in position to travel along paths parallel to the path of travel 01 the machine while being transported by the hau ing, .55 vehicle.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. 1 is an elevational view of a self-contained 5 power-operated road roller, embodying my im'- provements;

Fig. 2 is an enlarged sectional elevation taken on the line 22 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is a side elevationof the machine shown in Fig. l with the front hitching mechanism adjusted to such elevation as to be in readiness to be connected to a hauling vehicle;

Fig. 4 is a rear view of the machineillustrat- 15 ing operation of the roller in a gutter while one of the rear steering wheels travels along the elevated surface of a curb;

Fig. 5 isan elevational view of the relative positions of the" parts when the portable road 20 roller is'hitched to a hauling vehicle and the road roller is adjusted to a position up off the road for fast transportation with the hauling vehicle;

Fig. 6 is a sectional view taken on the line 66 of Fig. 5, looking in the direction of the 25 arrows; a

Fig. 7 is a sectional elevation of a portion of the transmission brake applying mechanism;

' Fig; 8 is a sectional elevation taken on the line 8-8 of Fig. 9, looking in the direction, of. 30 the arrows;

Fig. 9 is a sectionalelevation of the transmission;

Fig. 9 is a sectional r elevational view oi the brake mechanism mounted in the brake drum at 35 the right-hand end of Fig. 9; I

Fig. 10 is a plan view of the machine shown in Fig. 1; v Fig. 11 is a sectional elevational view of the elongated reciprocating hydraulic motor pivot- 40 for operating the valve shown at he middle portion of Fig. 11;

- Fig. 14 is an elevational view; partly in section, of the hydraulic pumping mechanism for operating the-hydraulic motor shown in Fig. 11; Y

Fig. 15 is an elevationalview, partly in section; of the mechanism enabling a single actuating lever to eflect reversal ofthe machine and the operation of the clutch shown at the left-hand end of- Fig. 9;

Fig. 16 is asectional elevational view of a modifled valve and double acting pump adapted to operate the hydraulic motor shown in Fig. 11;

Fig. 17 is an elevational view, partly in section, of the left-hand side of the double acting pump and valve shown in Fig. 16;

Fig. 18' is a sectional plan view taken on the line |8|8 of Fig. 16;

.Fig. 19 is a sectional plan view taken on the line |9-|9 of Fig. 17;

Fig. 20 is a sectional elevational view taken on the line 20-20 of Fig. 19;

Fig. 21 is a diagrammatic view of the hydraulic circuits and connections for enabling the double acting pump to operate the hydraulic motor illustrated in Fig. 11;

Fig. 22 is a rear end view of the machine;

Fig. 23 is a sectional elevationof the rear wheelbrake actuator; and

T Fig. 24 is a section taken on the line 24-24 of Fi 22. By referring to Figs. 1,and 22 it will be seen that the vehicle frame comprises a rearwardly extending support 22 and forwardly extending side members 23, 23, the front ends of which are connected by the cross-piece 24. The rear end of form of a gooseneck having an abutment collar 3| anda conical nose 32 at its outer lower end to guide the neck 33 through an opening 34 in the horizontal plate 35 which is bolted at 36, 36 to the rear end of the truck frame 31 of a self-propelled vehicle, such as a truck, as shown in Fig. 3. By means of a series of bolts 28 and the vertical row of holes 38 in the plate 29, the latter may be adjusted in elevation through a. relatively wide range because the uppermost hole 38 may be lowered to the middle bolt and the lowermost hole 38 may be elevatedto the middle bolt. Consequently while the. roller is in the position, as shown in Fig. 3, the hitching device 38 may be lowered sufficiently to permit the neck 33 to extend through the opening 34 in the plate 35, whereupon a cotter pin may be inserted in the opening 33 to lock the hitching device 30 to the rear end of the truck frame 31. It will thus be seen that the roller may be operated by trailing behind a self-propelled truck.

As shownin Figs. 1 and 2 a stationary trans- "verse bearing shaft 40 is secured at its ends by means of the nuts 4|, 4| to the spaced-apart side members 23 on the main or vehicle frame. J our-, naled on the ends of the bearing shaft 40 at 42, 42 is a transverse tube 43 to which is welded at 44, 44 the side members45, 45 of a supplemental frame or sub-frame. The forward ends of the side members 45, 45 are connected by'the crosspiece 46.

Between the side members 45 of the sub-frame 45 (Fig. 6) is secured by means of the locking discs 41, 41 and the cap screws 48, 48 the transverse stationary bearing shaft 49. On the end portions of this shaft 49 at 50, 58 is '-journaled the central tubular or sleeve portion 5| of' the roller 52. It will thus be seen that the stationary shaft 49 acts'as'an axle for the drum 52 to rotate upon when in contact with 'the ground and driven thereover.

The drum 52 is hollow, as shown in Fig. 6 which is a sectional view taken on the line 66 of Fig. 5 looking in the direction of the arrows. A filling opening is closed by the screw plug 53 after the hollow roller drum 52 has been filled with liquid such as water. The weight of the roller may be regulated by the amount of water placed therein, and when desired the water may be drained from the roller so as to lighten the same for transportation back of the truck, as shown in Fig. 5.

Intermediate the ends of the front cross-piece 46 of the sub-frame are mounted the upright supports 54, 54 which may be welded at their lower ends to the cross-piece 46 so as to occupy the position illustrated in Fig. 10. Between the upper ends of the supports 54, 54 is secured the transverse bearing rod or pin 55 to which is pivoted or journaled the upper end of the piston rod 56, to the lower end of which is secured a' piston 51 movable up and down in the hydraulic cylinder 58, as shown in Fig. 11.

The lower end of the cylinder 58 is secured to a block 59 pivoted at 60 to the brackets 6|, 6| which extend rearwardly from the central portion of the front cross-piece 24 of the main frame, as shown in Fig. 10. The piston rod 56 extends upwardly out of the cylinder 58 through the stufling box 62, as shown inFig. 11. The hydraulic structure shown in Fig. 11 constitutes an elongated-reciprocating hydraulic motor be tween the ends of the vehicle frame and the supplemental frame, for adjusting the relative positions of the front ends of these frames, as illustrated in Figs. 1, 3 and 5 and more fully hereinafter explained.

As shown in Fig. 6, a. supporting ring 63 is secured, preferably by welding, to one of the end plates 52 of the roller 52 and to this ring 63 is secured by means of the cap screws 64, the ring sprocket 65 with which is adapted to mesh the endless sprocket chain 66 which also meshes with the driving sprocket 61 of the power transmission mechanism shown in Fig. 9.

Secured to one of the side members 45 of the supplemental frame so as to be rigid with the latter is a rearwardly extending protecting cover 68 for the sprocket 61. tecting cover 68 may if desired be secured to the rear end of the casing 69 and the latter secured to the sub-frame 45 by means of the cap screws 10, as shown in Fig. 5. The casing 69 extends In fact the proover the entire upper portion of the roller 52 by fitting over not only the side members 45 but also the front cross-piece 46 and having its upper side closed to provide a'receptacle for patching tools at II (Fig. 10) and in one corner of the latter a small tool box 12. tion of the casing 69 is an enclosed water compartment I3 normally closed by the cover '14. From (the bottom of the water tank 13 at 15, the water may pass to the transverse sprinkler pipe 16 which is located adjacent the roller 52, as shown in Figs. 1 and 10. By means; of a pull and push rod 71, a lever 18 (Fig. 10) may be actuated to open or close the valve 19 which controls the passage of the water from the water tank 13 to the transverse sprinkler pipe 16. The' cover plate 14 may beprovided with filling open- 80', 80, as shown in Fig. 10. Whenever during operation of the roller the latter has a tendency to pick up material, the valve 19 may be opened At the rear porso as to fiow water over the entire width of the operating face of the roller, thereby loosening adhering material and preventing the picking up of additional material from the roadway.

Secured to the rear ends of the side members 45 of the sub-frame, preferably by means of welding, is a bed plate 8| which is adapted to support the internal combustion engine and the power transmission mechanism between the same and the roller propelling endless sprocket chain 66. The bed plate 8I also constitutes the rear cross-piece of the sub-frame having the side members 45, 45. A plurality of bolt openings are distributed along the bed plate 81 at 82, 83, and 84 (Fig. 2) to enable the internal combustion engine and the power transmission mechanism to be very securely connected to the subframe. be provided with a starting crank 86 at one end thereof, as shown in Fig. 10. This internal combustion engine may comprise four cylinders equipped with an air cleaner, magneto with impulse starter, governor and fan.- The engine is preferably entirely enclosed and so also the power transmission gearing which operates on friction reducing bearings in an oil both (Fig, 9).

At that end of the internal combustion engine 05 remotefrom the starting crank 86 is a fly wheel 81 with which is associated the clutch 30 for connecting'the engine to the plural speed power transmission mechanism shown in Fig. 9, under the control of the operating lever 89 which is located within convenient reach of the operator while sitting on the seat 90 or standing on the platform 91! at the rear' end of the machine.

When the clutch 88 is applied, power will be.

transmitted from the internal combustion engine to the transverse shaft 92, as shown in Fig. 9. The shaft 92 extends through the stuffing box til and is journaled by means of the ball bearings M to the supporting partition 95 which may be integral with a part of the enclosing casing ht. Atthe right-hand end of the shaft 92 is a pinion 91 which meshes with an internal annular gear 88, the hub 99 of which is keyed to the sleeve shaft I00 which in turn is journaled by means of the roller bearings IN, IN on the stationary bearing shaft I02. The ends of the stationary bearing shaft I02 are mounted in the partitions 95 and I03.

The sleeve shaft I00 carriesspaced-apart pinions I04 and I05 which mesh respectively with the gear I06 and the idler I01, as shown in Figs. 3 and 9. The idler I01 meshes with the gear The gears I06 and I08 are journaled by means of the roller bearings I09 and III) on the reversfng shaft Ii I, the left-hand end of which is journaled in the casing I I 2 by means of the ball bearings M3. The left-hand end of the sprocket shaft M4 is reduced in diameter andjournaled bymeans of the roller bearings H5 in the cylindrical recess at the right-hand end of the reversing shaft III. The right-hand end portfon of the shaft m is journaled by means of the ball bearings H6 in the casing I I2.

The opposing inner faces of the gear elements I06 and I08 are provided with internal annular .gears H1 and H8 with which aread apted to .mesh the gears H9 and I on the shiftable clutch element I2I. A shipper I22 isadapted to slide the clutch element I2I along the splines :23 on the shaft m. It will thus be seen-that while the clutch element I2I together with its gears H0 and I20 are mounted to slide along the The internal combustion engine 85 may shaft III, they always rotate withthe latter; .-whereas the gear elements I06 and I08 are mounted loosely on the shaft III and do not rotate therewith unless the gear II9 meshes with the gear I I I or the gear I20 meshes with the gear I I8 When the gear I19 meshes with the gear II1, motion will be transmitted from the engine to the clutch 88, the shaft 92, gears 91, 98, and gears I04, I06, in one direction, whereas opposite direction of rotation of the shaft II I will be secured when the gear I20 meshes with the gear ,II8, because in such event the transmission will be through the gears I05, I01 and I08, as shown in Figs. 8 and 9.

Mounted on the right-hand end of the shaft III is a pinion I24 which meshes with a gear I25 mounted on the sleeve I26, the latter being in turn journaled by means of the roller bearings I21, I28 on the stationary bearing shaft I29. The

The sprocket shaft II 4 is journaled by means of the ball bearings I3I in the supporting casing and in the cap I32 which is secured by means of cap screws one of which is shown at I33 at the right-hand portion of Fig. 9. r

The sprocket shaft H4 is splined at I34 intermediate its ends to carry the speed shifting gear element I35. This speed shifting element is provided with a gear I36 which is adapted to mesh with the gear I when the element I is shifted toward the right, as viewed in Fig. 9. The left face of the element I35 carries an internal annular gear I31 which is adapted to mesh with th pinion I24.

A gear shift lever I38 may be mounted on the support I39 as shown in Fig. 9 for connection at vits lower end with the gear shift element I35. The rod I40 may be notched at IM to receive the spring pressed latch I42, and connected to the lower portion of the gear shift lever I38 to enable the operator to determine to what positions to move the lever when the speed of transmission is to be varied. After the gears I31 and I24 have been brought into mesh, the gear shift lever I38 may be locked by movement into the notch I43, and when the gears I36 and brought into mesh, the gear shift lever I 38 may be locked by movement into the notch I44.

when the gears I31 and I24 are in mesh, fast I30 have been speed will be transmitted to the sprocket 61 and thence to the road roller, but if thegears I30 and I36 are brought into mesh a slower speed will be the sprocket shaft H4 it will rotate therewith. The brake mechanism I which is associated with the rotating brake drum I45 is preferably of the expansion type and so connected to stationary supports mounted on the bed plate 8I as Inasmuch as the brake drum I45 is keyed to to enable the brake lever I 46 to be moved longi- -tudinally of the machine from the operators sta- ,tion,at.the rear end of the machine. The double arm cam I41 shown in Fig. 9 may be directly on steep grades. This will enable a single operator to control the machine on steep grades by using one hand for the steering wheel and the other hand for operating the reverse gearing which is so arranged, as shown in Fig. 15, that whenever the reversing gear element I2I is in neutral position, the clutch is released. However, since the brake may be applied when the clutch is released, the machine will not get out of control on steep grades. As shown in Fig. 9, a protective covering I secured to the stationary ring I32 may be provided for the brake mechanism I45 within the brake drum I45.

As shown in Fig. 15, the lever 89 for operating the reversing mechanism is keyed to the hub of a bevel gear I5I which is journaled on a stub shaft I52 secured rigidly to the bracket I53 which extends rearwardly from the casing 96. The bevel gear I5I meshes with another bevel gear I5I which is mounted to rotate on a stationary longitudinal axis I54, and is secured to a short hori- 'zontal V-shaped actuating lever I55 and to a relatively long actuatinglever I56 which extends downwardly and is connected at its lower end by the link I51 to the short lever arm I58 keyed to the rock shaft I59. It should be understood that longitudinally of the transversely mounted comprising a ring I63 secured to the fly wheel 81 to rotate therewith. The clutch disc I64 is mounted on the hub I65 which in turn is splined to the left-hand end of the shaft 92. Screwthreaded into the ring I63 is an abutment ring I66 against the inner face of which are adapted to engage the cams I61. A floating ring I68 is j connected by springs I69 to the ring I63. Levers I10 are ful'crumd adjacent the cams I61 in. U- shaped supports I1I projecting from the floating ring I68. When the upper ends of the shipper I62 move toward the left, as viewed in Fig. 9, the

cams I61 will force the rings I68 and I63 apart against the action of the springs I69 and thus effect application of the clutch" through the friction rings I12. Limit stops are provided at I18 to obtain the proper limiting positions of the cams I61.

I The ball bearing cage I14 is connecteed to the upper ends of the shipper arms I62 and this ball the short V-shaped lever arm I55 projecting toward-the right from the bevel gear I53, engages a Y-shaped device I16 which is rigidly connected to the depending actuating arm I11 and pivotally mounted on the bearing I18. To the lower end of the lever arm I 11, is pivoted at l19 th'e left-hand end of a slide rod I which is mounted to slide in the bearings I8I and I82. By means of springpressed ball latch mechanism I83, the slide rod I80 will be held in any one of three positions to which it has been moved. Intermediate the ends of the slide rod I80, is pivoted the lever arm I22 of the shipper I22 shown in Fig. 9. It should be understood that when the lever-89 is moved in one direction the revers gearing will be operated to effect a certain direction of movement of the machine, and when the lever 89 is moved in the opposite direction the reverse gearing will be operated to move the machine in the opposite direction. For instance, if the reverse gear element I2I shown in Fig. 9 is moved toward the left the machine may be moved forward, and when the reverse gear element I2I is moved toward the right, the machine may be moved rearwardly. When the reverse gear element I2 I is in its neutral position as shown in Fig. 9, the slide rod I80 will occupy the position shown in Fig. 15 and the connections to the clutch at the left-hand end of Fig. '9 will be such as to release the same. It should be particularly noted that whenever the reverse gear mechanism shown in Fig. 9 is in neutral position, the clutch will always be released.

However, when the reverse gear element I2I is in transmitting position either at the left or at the right, as viewed in Fig. 9, the Y-device I16 shown in Fig. 15, will occupy such a position as not to interfere with the application and release of the clutch shown at the left-hand end of Fig. 9. In other words, the machine may be started and stopped whenever desired while going in the same direction but when reverse movement of the machine is to be effected the clutch will be compelled to be moved to released position by reason of the interlocking connection shown in Fig. 15, when the gear shifting element is moving through its neutral position. When the machine is to be reversed on steep grades; the brake I45, I45 may be applied and held applied to any extent desired, as above described.

' When the operator is at his station at the rear end of the machine he may with one hand operate the steering wheel I64 while with the other hand he may move the reversing lever 89 either forwardly or rearwardly while the brake I45, I45 is set partially applied, as indicated'by the latch mechanism I49 in Fig. 7. In this manner. a single operator may readily control the operation of the roller back and forth on a step grade either uphill or downhill.

The forward and reverse motion of the roller is therefore controlled by a single conveniently located lever at the operators station at the rear end of the machine. The gear shift lever and the hand brake lever, the motor ignition and the control rod 11 for the sprinkler valve 19, are, also within easy reach of the operator at the/ .single station at the rear end of the machined,

The steering wheel I84 may be of the large auto motive type and connected by means of the gear ing I86 to the depending lever arm I81- and thence by the link I88 to the U-shaped crank I89 which is connected directly to one wheel and by means of the link I90 which is connected to the crank I9I to the other wheel, as shown in Fig. 10. 'The steering of the machine is effected by turning the wheels 21, 21 on the vertical axes 26, 26 relatively to the rear axle 25. v

When the roller is operated as a self-propelled road roller, the main and supplemental frames are arranged as shown in Fig. 1,- the front ends of the frames being locked in adjusted positions relative to each other by the hydraulic motor 58 "truck. For instance, if the driving'chain 66 is disconnected and the upper end of the piston rod 56 is disconnected from the upper ends of the supports 54, the roller construction shown could be operated as a trailer road roller. After disconnecting the upper end of the plunger 56 from the supports 54, the elongated hydraulic motor cylinder 58 could be leaned forward and held there or disconnected at 60 from the bracket 6I. While being towed by a self-propelled truck, an operator could be stationed at the rear end of the machine to actuate the steering mechanism. In the event that this operation is effected, the front end of the vehicle frame would be held at adjusted elevation by the supporting plate 35 at the rear end r of the truckpframe 31, the rear end of the vehicle frame would be supported on the steering wheels 21 and the roller itself would be free to move up and down on its pivot 40 relatively to the vehicle frame, between the side members 23 thereof.

When operating the roller as a trailer road roller while connected to a towing self-propelled is provided with a relatively narrow rearwardly ed in Fig. 5. The locking of the rear steering extending frame 22. Pivoted to the frame 22 at I95, as shown in Fig. 1, is a latch plate -I96 which may be moved downwardly by means of a. rearwardly extending pull rod I91 which ,is pivoted at its forward end at I90 to the upper end of the latch plate I96. This latch plate I96 is located midway between the sides of the frame.

22, as shown in Fig. 10. The cross-link I90 of the steering mechanism has welded thereto, two

rearwardly extending spaced-apart plates I99, I99

to provide a slot between the same for'receiving the latch plate I96. Consequently, when the wheels 21 are symmetrically arranged, as shofwn in Fig. 10, the latch plate I96 may be inserted in the slot between the plates I99 and thus lock the steering mechanism against being operated. The locking position of the latch plate I96 is illustratwheels against movement in either direction on their'vertical axes 26is'a'lso useful when the roller is elevated off the roadway, as shown in Fig. 5, and being towed at transportation speed hack of a self-propelled truck. I o

As shown inFlg. 10, diagonal-brace rods 200, 200 aresecured at their rear endsyto the axle "25 near-their outer ends. The forward ends of the brace 200' are connected to a S p rt 20I which is pivoted on a longitudinal axis 202 to the frame 22 midway between the sides thereof. The longitudinal pivot 22 is in alinement with the rear pivot shown at 203 in Fig. 4. It will thus be seen that the axle frame structure comprising the axle proper 25 and the diagonalv rods 200 are pivoted to the frame 22 at spaced-apart points 202 and 203 which are in longitudinal alinement with each other.

The rear axle 25 is pivoted at 203 to the spaced parallel transverse plates 22 depending from the rear end of the frame 22, as shown in dotted lines in Fig. 1. The axle 25 carries an inverted vshaped plate 204 at the center thereof, as shown in Fig. 4. This plate is perforated at its upper end at 205 and this perforation may be brought into registry with the perforations 206 in the rear spaced-apart transverse parallel plates 22' as shown in dotted lines in Fig. 1. A locking pin 201 may be inserted through the registering openings 205 and .206 to lock the rear axle against tilting movement on the longitudinal axis 203. The locking pin 201 at its rear end is provided with a perforation 200 (Fig. 10) adapted to be brought into registry with theperforation in a horizontally extending bracket plate 209, and another locking pin may be inserted through these perforations so as to lock the locking pin 201 in place. This locking is desired when the machine is operating over level roadways or when it is being towed over level roadways. When the roller is operating in a gutter with one wheel 21 traveling along the curb, as shown in'Fig. 4, the plate 204 remains unlocked and the locking pin 201 may then be inserted in the opening 210 and held in position by the pin 2 for safe-keeping.

Referring now to Figs. 12, 13 and 14, I will describe the hydraulic control system for the elongated hydraulic motor pivotally connected at its ends between the main and supplemental frames. The manually operated pump 212 shown in Figs. 13 and 14 may be mounted on the crosspiece 24 at the forward end of the main or vehicle frame, as shown in Fig. 10, so as to be in proximity to the elongated hydraulic motor illuspreferably oil which is placed in the casing 214,

the latter serving as the liquid reservoir or source of supply of the pressure medium. This reservoir may comprise a base 2l5 and a cap plate I 2I5 ,connected by the cylinder 2l1 and bolted together as illustrated at 2", 2I8. The lever H3 is connected to the upper end of a rod 2I9 which extends downwardly through the stuffing box'220 and through a stationary bearing block '22I at the lower portion of the reservoir 2.

To the lower end of the rod 2I9 is connected a pinion 222 which meshes with two separate gears 223. and 224 mounted on vertical valve stems, theupper ends 225, 226 of which slide vertically in bearings in the stationary bearin block 221.

' The vertical valve stems are screw-threaded at 221, 220 below the gears 223 and 224 and fit screw-threaded openings in the central portion of the base 2I5. Below the screw-threaded portions 221, 220 the valve-stems are'reduced in diameter to aflord free passageway around the same for oil from the reservoir 2 through the vertical openings :29, 23lwhich-extend from the upper centers of the valve stems to a lateral passageway communicating with the recesses 229', 230' in the base 2l5, as shown in Fig. 13. At the lower ends of the valve stems are valves 23!, 232 which are adapted to be seated when moved downward sufficiently to engage the base block 2I5. When the valve 23l is open as shown in the left-hand portion of Fig. 13, communication will be established between the chamber 229' and the passageway 233. When the valve 232 is closed, as shown in the right-hand portion of Fig. 13, the communication between the chamber 230 and the passageway 234 is closed. It

I should be understood that the screw-threads 221 and 228 are respectively right-handed and lefthanded, and therefore when the pinion 222 rotates the gears 223, 224, one valve 231 will be moved up while the other valve 232 will be moved down, and vice versa. It is the opening and closing of the valves 231, 232 by means of the lever 2| 3 that controls the direction which the piston 51 will take when the manually operated pumping mechanism shown in elevation in Fig.

14 is operated.

The manually operated pumping mechanism shown in elevation in Fig. 14 comprises an actuating lever 235 pivoted at 235 to give the arms 231, 231 an oscillating movement and thereby move one piston plunger 238 up while moving the other down. Each of the cylinders 239, 239' has at the lower end thereof check valvesthe one designated 24!) opening upwardly, and the other designated 24l opening downwardly. Liquid may flow into the cylinder 239 at the port 242 past the check valve 240 and the liquid may flow from the cylinder 239 past the check valve 241 out from the port 243.

The operation may best be understood by reference to Fig. 12. When the valve 232 is closed and the valve 23l is open and the piston 238 is moving downwardly, liquid from the cylinder 239' may move past the check valve 24 I through the pipes 244, 245 into the chamber 229' and thence through the vertical opening 229 into the liquid reservoir; This exerts no operating pressure through the pipe 245 into the cylinder 58 above the piston 51. When the piston 238' moves down, the piston 238 moves upbut the upward movement of the piston 238 opens the valve 240, drawing liquid into the cylinder 239 from the reservoir through the pipe 241. Upward move- .ment of the piston 238 closes the valve 2. Consequently, downward movement of the piston 238' and upward movement of the piston 238 while the valve 232 is closed and the valve 23! is open, permits the piston 51 to remain in its position shown in Fig. 12, but the cylinder 239 has-been filled with liquid in preparation for an operation of the hydraulic motor 58.-

the chamber 229' and the passageway 229 into the supply reservoir 2I4. The upward movement .of the piston 238' will automatically open the valve 240 and closethe valve 24!. The upward movement of the piston 238' therefore draws in a supply of liquid into the cylinder 239.

After the piston rod 56 has been moved upwardly to the desired extent to lift the front end of the sub-frame to an elevated position relative to the vehicle frame, as illustrated in Fig. 5,

the roller will be raised oil? the roadway and the weight of the structure will be exerted downwardly on the piston 51 of Fig, 11. The valve 232 being closed and the check valve 24I having automatically closed, there will be notendency for the roller sub-frame to move out of its adjusted position even after the actuation of the manual pumping mechanism is discontinued.

After the road roller has been towed to its destination as illustrated in Fig, 5, it may be let; down to the road surface by simply opening the valve 232 and closing the valve 231. The'weight of the front end of the roller unit will then exert downward pressure on the piston 51 and the liquid below the same will flow through the pipes 248, 249 into the chamber 230' and thence through the passageway 230 into the supply reservoir.

After the roller 52 has engaged the road surface and it is desired to speedily unhook the tongue 39 from the rear end of the truck, the

manually operated pump'may be actuated while the valve 23l is closed and the valve 232 is open.

When the piston 238 is in its uppermost position and the cylinder 239' filled with liquid, downward movement of the piston 238' will close the check valve 240', open the check valve 24V and force the liquid through the pipes 244, 246' into the cylinder 58 above the piston 51, the valve 23l being closed. Theliquid below the piston 51 will then flow through the pipes 248, 249 into the chamber 230 and through the passageway 23!! into the supply reservoir, the check valve 2 being at this time closed. In this manner the front end of the vehicle frame may be lifted relatively to the sub-frame and therefore the tongue may be disconnected from the rear end of the ,truck' 31 after which the sub-frame as shown in Fig. 3 may again be nested in the main frame, as illustrated in Fig. 1, for operation of the roller as a self-contained power-operated machine,

When the roller contacts with the roadway, as shown in Figfl, operation of the elongated reciprocating motor will lift or lower the hitching device 30. When the roller is in the elevated position shown in Fig, 5, it must first be let down to the roadway before the hitching device 30 can be released by removing the cotter pin 39 and operating the hydraulic motor 58 to elevate the hook from the plate to the position shown in Fig. 3.

When the sub-frame 45 is moved to the position shown in Fig. 5 for holding the roller 52 up off i the roadway while being towed by the truck at transportation speed, the sub-frame may be locked in adjusted position by means of the pin 250 which is connected to a chain 25l and the latter secured to one of the side frame members 23. The pin 25!) extends through an opening in the side member 23 and also through a, registering opening in the side frame member 45. Such pins 250 may be used on opposite sides of the machine, as shown in Fig. 10. When the road roller is operating as a self-propelled machine as illustrated in Fig, 1, the pin 250 may be inserted through registering openings in the side frame members 23 and to hold the frames against relative up and down movements. After. the

locking pin 250 has been inserted into the registering openings, either as shown in Fig. 1 or as shown in Fig. 5, a locking plate 252 may be sccured at 253 to the side frame members 23 to prevent the pin 250 frombeing vibrated out of its locking position. The locking mechanism comprising the pins 250 on opposite sides of the machine as shown in Fig. 10, secures the frames together in adjusted relative positions so as to be independent of the hydraulic mechanism illustrated in Figs. .11 to 14 inclusive. In other words,

the hydraulic mechanism is relied on to positively adjust the relative positions of the frames and may be relied on to hold them in relative adjusted positions, but it is preferred to add the positive locking mechanism comprising the looking pins 258. particularly when the machine is to .be called upon for heavy duty overrough roadacting pump shown in Figs. 12, 13 and 14. The

apparatus shown in Figs. 16 to 21, inclusive; is described and claimed in my co-pending divisional application, Serial No. 257,814, filed Feb. 23,1939, for an improvement in a Road roller and hydraulic system therefor.

It can readily be seen by comparing Fig. 16 with Fig. 13 that the gearing and valve mechanism of Fig. 13 have been omitted and a much simpler valve structure substituted therefor at the lower end-oflthe actuating rod 2I9'. In Fig. 16 the base.2|5 is clamped to the cap 2l6' by means of the cylinder 211' and the bolt rods 218'.- .The lever 2| 3 is connected to the upper end of the valve rod 219'.

.The valve 254 at the lower end of the valve rod 218' is slightly tapered and is pressed upwardly by the spring 255 seated in the screw cap 256 at the center of the bottom of the base 2| 5', as shown in Fig. 16. r

Fig. 18 is a sectional plan view on the line l8-l8 of Fig. 16 and shows that the various passageways desired may be obtained by simple straight line boring in the base 215 and the ends of the bores closed by means of screw plugs as illustrated at 251, 258, 259 and 268.

The valve 254 is a simple two-way valve, as. illustrated in Figs. 18 and 21. An opening from the. reservoir 2l4' leads downwardly through the passageway 261 into the transverse passageway 262 to the valve 254, shown in closed position in Fig. 18. When thevalve 254 is in the position shown in Fig. 21, however, weight on the piston 51 will cause the liquid to move through the pipe 248 past the valve 254 and thence through the passageways 262 and 26! into the reservoir 214'. At the same time liquid can be drawn from the reservoir through the pipe 263 past the check valve 264, pipe 265, cylinder 266, past the check valve 261, the pipe 268, pipe 269, past the valve 254, and pipe 246. In other words thiscircuit will be established from the reservoir 2I4' to the upper portion of the cylinder 58 by suction from above the piston 51, while pressure ,is exerted below the latter by the weight of the piston rod 56, to force liquid into the reservoir 2| 4'.

However, if the roller is on the roadway and it-is desired to positively lift the front end of the vehicle frame to elevate the hitching device 38 preparatory to hooking it to the hauling truck, the double acting pump shown in Figs. 17 and 21 may be operated to force liquid into the cylinder 58 above the piston 51. When the piston-218 is forced down by the lever 235 the check valve 264 will be closed but the check valve 261 will be opened and liquid will therefore be forced through the pipes 268, 269 and 246 to; the cylinder 58 aboveth'e piston 51. llvhenathe plunger 218 is moved down," theplun'ger 218' moving up will close the check valve 2H and open the check valve 212 to draw liquid from the reservoir 214' through the pipe 213 in the cylinder 214. After the cylinder 214 has been filled with liquid and the plunger 218' is at the upper limit of its stroke, the reversal of the latter will close the check valve 212 and open the check valve 2. At the same time the upward movement of the plunger 218 will close the check valve 261 and open the check.

valve 264. The downward movement of the plunger 216' will force the liquid through the pipes 215,269 and 246 into the cylinder 58 above the piston 51. It will thus be seen that upon each downward stroke of the plungers 218 and 218', liquid will be forced into the cylinder 58 above the piston 51.

By changing the position of the valve 254 from that shown in Fig. 21 to a position 90 degrees therefrom, the pipe 269 will be connected to the pipe 248 and the pipe 246will be connected to the return passageway 262. .Then upon operation of the manually operated pump, each downward stroke of the plungers 218 and 218' will force liquid into the lower end of the cylinder 58 below the piston 51, while the liquid above it will be discharged back into the reservoir. Movement of the valve 254 to the position shown in Fig. 18 will lock the piston 51 in adjusted position in the cylinder 58 and therefore hold the main and supplemental frames in adjusted relation to each other.

. While the engine is operating but with the clutch 88 shown at the left hand end of Fig. 9 released, the brake mechanism shown in Figs. 9 and9 may be applied to hold theroller stationary on the roadway. This enables the machine to be held stationary on a grade While the operator is absent from his station. It is preferred to use the brake mechanism operated by the lever I38 only for emergencies and to rely during normal operation of the machine even on steep grades, on brake mechanism associated with the steering wheels and operated by a foot pedal 211 at the operator's station,

Fig. 22 is the rear end of the machine showing the hydraulic connections between the foot pedal 211 and the brake mechanism associated with the rear wheels. Fig. 24 is a section taken on the line 24.24 of Fig. 22 looking in the direction of the arrows. Fig. 23 is a longitudinal sectional elevation'of the hydraulic brake actuating mech anism connected to the foot pedals 211 for operation thereby. The hydraulic actuating mechanism shown in Fig. 23 may be mounted on one of thevertical side plates of the frame 22, as shown in Figs. 22 and 23.

The foot pedal lever 211 ispivoted to the frame 22 at 218 and is provided with a short arm 219 connected at its lower end to a spring 288, the other end of which is connected at 28| to the frame22'. Pivoted at 282 with the arm 219 is a piston rod 283, the inner end of which extends into-.a conical recess 284 of a piston 285 which slides along the cylinder 286 beneath an oil reservoir 281. A filler and feeder is located at 288.

When the footiis released fromv the. pedal 211,

the piston 285 occupies the position "shown in Fig.

v\end's. At the right-Hand end of the piston 285 lis a primary cup 291. A secondary cup is located "at 292 'being held in place by the retaining ring 293 so as to prevent oil from leaking into the bellows boot 294.

A by-pass port is located at 295. It will thus be seen that liquid is on both sides of the primary cup 29l. A double check valve is located at 296. A spring 291 extends between the primary cup 29l and the check valve 298 and an .inner spring 299 associated with the check valve 300.

The pipe fitting at 30I is connected by 'means of the flexible hose 302, 303, 303 to the cylinder 304 of each of the brake devices shown in section in Fig. 24. Pistons extend into opposite ends of the cylinder 304 with a spreading spring 305 between the same. The outer ends of the pistons are pivotally connected to the brake shoes 3%, 306 which are adapted to engage the brake drum 301. It should be understood that the brake shoes are mounted on the non-rotatable hub portions of the wheels, whereas the brake drums 301, 301 are connected to the wheels to rotate therewith.

As soon as the operator places his foot on the pedal 211 to operate the brakes associated with the rear steering wheels, the primary cup 291 is moved toward the right and the port 295 immediately closed. Thereupon pressure will be produced in the cylinder 286 to the right of the cup 29!, as viewed in Fig. 23, and the check valve 300 will open and the liquid will flow through the pipes 303 to the brake actuating cylinders 304 thereby causing application of the brake shoes to the brake drum 301 against the action of the restoring springs 305 and 308. When the operator releases his foot'the spring 280 will restore the piston 285 to its initial position shown in Fig. 23, whereupon the port 295 will be uncovered and as the brake shoes are released the liquid will flow into the cylinder 286 by opening the check valve 298 while the check valve 300 remains closed. Any excess of liquid is by-passed through the port 295 into the reservoir 281.

The brake mechanism shown in Fig. 24 and the actuating mechanism in Fig. 23 are of well known construction. Hydraulic mechanism of this or similar type is preferred because it is well adapted for mounting on the frame 22 for connection by flexible hose 303 to the rear steering wheels. In other words, the use of foot operated hydraulic brake mechanism for rear Wheels enables the operator to operate the steering mechanism with one of his hands and the rear wheel brake mechanism with one of his feet without any interference. That is to say, by reason of. the flexible connections at 303 the steering wheel-unit may be operated without interfering with the application of the brake mechanism by the operator at will. I

It should be particularly noted that when the operator releases the foot pedal 211 the brake mechanism associated with the rear wheels will be automatically released, whereas the brake mechanism associated with the right-hand end of the power transmission mechanism, as shown in Fig. 9, may be set in predetermined applied position as shown in Fig. 7, so that the roller may be held stationary on a steep grade or elsewhere during absence of the operator from the machine. When the ,machine is operating with its parts related .as shown in Fig. 1, it is preferred to release the brake mechanism associated with the power transmission and rely on the brake mechanism associated with the rear wheels for assisting the operator in controlling the machine. Only during emergencies or during the absence of the operator or while the machine is being towed, need the brake mechanism be applied as shown in Fig. 7 to hold the roller against rotation relative to the frame on which it is mounted.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In a road roller, the combination with a vehicle frame, of steering mechanism comprising rear supporting wheels for said frame, mechanism at the forward end of said frame for connecting the same to towing means, a supplemental frame pivoted at one 'end to said vehicle frame intermediate the ends of the latter, a roller carried by said supplemental frame, poweroperated apparatus for driving said roller when engaging the roadway to propel said vehicle when disconnected from said towing means, said wheels and said rollers serving as the sole support for said frames when the vehicle frame is disconnected from the towing means and mechanism connected between said frames for lifting the roller up off the roadway when said vehicle frame is connected to and supported by said towing means.

2. In a road roller, the combination with a vehicle frame, of a road roller mounted thereon, a rear transverse axle pivoted to said frame on a longitudinal axis, and steering mechanism comprising rear wheels at the ends of said axle to permit operation of the roller in a gutter while one of said wheels travels in an elevated position along a curb.

3. In a road roller, the combination with a vehicle frame, of a road roller connected thereto, a rear axle pivoted to said frame to tilt relative 1y thereto on' a longitudinal axis, mechanism for locking the axle in adjusted position relative to said frame, steering mechanism comprising rear wheels at the ends of said axle, and self-com' tained power-operated apparatus under control I 4. In a road roller, the combination with a I said vehicle frame, and a fiuid pressure motor for tilting said supplemental frame relatively to said vehicle frame to lift the roller up off the roadway for transportation While such vehicle frame-is connected to said truck frame.

-. 5. In va road roller, the combination with a.

vehicle frame, of ground engaging steering wheels for supporting the rear end thereof, mechanism at the front end of said frame to hitch the same I to a hauling vehiclefor transportation, a supplemental frame connected to said vehicle frame for adjustment relative thereto, a roller mounted on. said supplemental frame, mechanism betweensaid when the front end of said vehicle frame is hitched to and supported by ahauling vehicle and while said steering wheels remain in engagement with the ground, and means for locking the supplemental frame to said vehicle frame to hold the roller at adjusted elevation independently of said lifting mechanism.

6. In a road roller, the combination with a vehicle frame, of wheels always in engagement with the ground for supporting the rear end of said frame, a hollow roller adapted to be filled with liquid to increase its weight for operation, a supplemental frame pivoted to said vehicle frame and carrying said roller, mechanism at the front end of said vehicle frame to hitch the same to a hauling vehicle, self-contained power- .operated mechanism connected to said roller to rotate the same while filled with liquid and while engaging the road surface, and mechanism between said frames for lifting the roller up off the road when empty and while the front end of said vehicle frame is hitched to and supported by a hauling vehicle and the rear end of said vehicle is supported by said wheels.

7. In a road roller, the combination with a vehicle frame, of steering mechanism comprising supporting wheels connected to the rear end of said vehicle frame so as to remain at all times in engagement with the ground, a supplemental frame pivoted at its rear end to said vehicle frame intermediate the ends of the latter, a road roller mounted on said supplemental frame, a fluid pressure motor pivotally connected at its ends to said frames at the. forward ends of the latter, a fluid pressure pump connected to said motor, and connections comprising valve mechanism between said pump and motor for effecting positive adjustment in elevation of the front end of the supplemental frame when the front end of the vehicle frame is supported independently of said roller and for effecting positive adjustment in elevation of the front end of said vehicle frame when the front end of said supplemental frame is supported by the roller resting on the ground.

8. In a road roller, the combination with a main frame, of a wheeled support for the rear end thereof, a,hitching device adapted to connect the front end of said main frame to a hauling vehicle, a sub-frame pivoted to said main frame on a transverse horizontal axis and in termediate the ends of the latter, a road roller mounted on said sub-frame, and locking mechanism between said frames for holding the axis of the road roller in predetermined relation to said frames.

' 9. In a road roller, the combination with a supporting frame, of a wheeled support for one end thereof, a hitching device at the other end of said frame and adapted for connection to a transportingvehicle, a road roller, and a supplemental frame connecting said roller to said supporting frame to give freedom of movement up and down of the roller relatively to said supporting frame intermediate the ends thereof so that the entire weight of the roller will be supported on the roadway while the machine is being transported therealong by said vehicle 10. In a trailer road roller, the combination with a supporting frame, of a wheeled support for the rear end thereof, a hitching device at the front end thereof adapted to be connected to a hauling vehicle, a road roller, a supplemental frame connected to said vehicle for movement therewith along the roadway and for movement up and down relatively to said supporting frame intermediate the ends of the latter to secure support of said'roller on the roadway independently of said rear wheeled support and said front hitching device, whereby the weight on the wheeled support is independent of the weight of the roller.

11. In a trailer road roller, the combination with a main frame, of a wheeled supportfor the rear end thereof, a hitching device for supporting 'the forward end of said frame on the rear end of a hauling vehicle, a supplemental frame pivoted to said main frame on a transverse axis between said hitching device and said rear wheeled support, and a road roller mounted on said supplemental frame to rotate relatively thereto on a transverse axis parallel to said first-named axis and spaced therefrom, whereby the weight of the roller on the roadway will be independent of the weight on the wheeled support.

12. In a road roller, the combination with a' frame, of a road engaging roller mounted thereon and supporting one end thereof, power means for driving said roller, a transversely extending axle pivoted to said frame on a longitudinal horizontal axis, wheels at the ends of said axle, and steering means for said wheels, said axle and wheels supporting the other end of said frame while providing relative tilting between said axle and frame on said longitudinal horizontal axis, to permit one of said wheels to travel along an elevated surface at one side of the path of travel of the roller.

13. In a self-contained power-operated roller, the combination with a roller unit comprising a supporting frame having mounted thereon selfcontained power-operated apparatus connected to a ground engaging roller to drive the same, of a hauling and steering frame, steering mechanism at the rear end of said hauling and steering frame, a pivotal connection between said roller unit and said hauling and steering frame intermediate the ends of the latter, mechanism at the front end of said hauling and steering frame adapted to be connected to a hauling vehicle, mechanism between said frames at the forward end of the roller unit to adjust the elevation of the roller relative to the hauling and steering frame, an operators station at the rear end of the machine, and controls within reach of the operator at said station for effecting operation of the roller and steering of the machine.

14; In a road rolling machine, the.combination with a main frame, of a sub-frame pivoted thereto on a transverse axis, steering means connected to the rear end of said main frame, a roller on said sub-frame, power-operated apparatus for driving said roller to propel the machine, mechanism adapted to connect said main frame to a' towing vehicle, and means for adjusting the relative positions of said frames including the elevation of the roller off the roadway when said mechanism is connected to said towing vehicle for support of the front end of the main frame there'by while the rear end of said frame is supported by said steering means.

15. In a trailer road roller, the combination with a main frame, of steering mechanism connected to the rear endthereof, a sub-frame, a roller carried by said sub-frame, a device adapted to hitch the front end of the main frame to a towing vehicle frame, and mechanism for adjusting the relative positions of said frames on a hori zontal transverse axis to regulate the downward pressure on the roadway exerted by said roller,

16. In a road roller, the combination with a vehicle frame, of steering wheels for Supporting the rear end of said frame, mechanism at the front end of said frame to connect the same to a fast traveling hauling vehicle for rapid transportation, a supplemental frame connected to said vehicle frame for adjustment relative thereto, a roller mounted on said supplemental frame, self-contained power-operated apparatus connected to said roller to drive the same and thereby propel the machine for rolling purposes while said wheels remain in engagement with the surface being rolled and while the vehicle frame is disconnected from said hauling vehicle, steering mechanism connected to said wheels, and means between said frames for adjusting the elevation of the front end of said vehicle frame relative to .the hauling vehicle and for adjusting the elevation of the roller relative to the road surface when said vehicle frame is connected to said hauling vehicle, the construction and arrangement being such that when the roller engages said surface, the front end of the vehicle frame may be adjusted in elevation for connection to the hauling vehicle and when the front end of the vehicle frame has been connected to the hauling vehicle the roller may be lifted off the road surface to facilitate the aforesaid rapid transportation.

17. In a road roller, the combination with supporting framework, of rear steering wheels for supporting the rear end of said framework, a roller mounted in said framework remote from said steering wheels in position to support the forward portion of the framework while said steering wheels support the rear portion thereof, means remote from said steering wheels comprising a fluid pressure motor for adjusting the elevation of said roller relative to said framework, and means comprising a pump connected to said fluid pressure motor to operate the same.

18. A road roller comprising supporting framework and a roller mounted therein, steering mechanism mounted on said framework independently of said roller, means comprising a fluid pressure motor distant from said steering mechanism for adjusting the elevation of said roller relative to said framework, a double acting pump connected to said motor, and valve mechanism for controlling the direction of movement of the motor to eiiect adjustment in elevation relative to the road surface of that end of the framework adjacent the roller.

19. In a road rolling machine, the combination with a main frame, of a pair of supporting and steering wheels at the rear end thereof, steering mechanism connected to said steering wheels, a supplemental frame connected to said main frame for tilting adjustment relative thereto, a roller mounted on said supplemental frame at the forward end portion of the machine, an operator's station at the rear end of the machine, self-contained power-operated mechanism for driving said roller to propel the machine under the control of the operator at said station, said steering mechaparatus connected to said roller to drive the same and thereby propel the machine along the roadway, and mechanism for adjusting the tilting of said frames relative to each other and each relative to the level of the road surface.

21. In a trailer road roller, the combination with a supporting frame, of steering apparatus connected to the rear end thereof, mechanism for hitching the front end of said frame to a towing vehicle for support thereby against upward and downward movements relative to said towing vehicle, a road roller, means for connecting said road roller to said frame for adjustment in elevation relative thereto, and means for adjusting the elevation of said road roller relative to said frame to regulate the downward pressure on the roadway exerted by the roller as it travels along behind the towing vehicle and said hitching mechanism holds down the front end of the frame while said steering apparatus is being operated to co-act with the towing vehicle in keeping the roller traveling along its working path.

22. In a road roller, the combination with a vehicle frame, of supporting wheels for the rear end thereof, a sub-frame pivoted at its rear end to said vehicle frame intermediate the ends of the latter, a road roller mounted on said sub-frame, a

receptacle for water mounted on said sub-frame, self-contained power-operated mechanism connected directly to said road roller to drive the latter and thereby propel the machine along a roadway, means between said frames for adjusting the relative positions thereof and thereby adjust the tilting of said water receptacle relative to the road surface, means comprising a valve for flowing water from said receptacle on to said roller, means for controlling said self-contained power-operated mechanism from a single operators station, and means for operating said valve from said station.

23. In a road rolling machine, the combination with a supporting frame, of supporting steering wheels for the rear end of said frame, steering mechanism connected to said wheels, a hitching device'at the other end of said frame and adapted for supporting connection to a self-propelled truck, a road roller, and means for connecting said road roller to said frame between said hitching device and said steering wheels for freedom of up and down movement relatively to said frame so that the entire weight of the roller will be supported on the roadway while the machine is being transported therealong by said self-propelled truck.

24. In a portable road rolling machine, the combination with a vehicle frame, of a roller connected thereto, steering apparatus connected to said frame, an engine, power transmission mechanism between said engine and said roller, means comprising a clutch and reversing mechanism for connecting the engine to said power transmission mechanism to drive the roller in either direction to secure rolling back and forth over a patch in the roadway, an operating lever, mechanism connected between said lever and said clutch to effect the application of the latter whether the lever is moved in one direction or the other, and means for effecting the setting of the reversing mechanism for driving the roller in opposite directions when said lever is driven in opposite directions, the construction and arrangement being such that when said lever is in neutral position intermediate its limits said clutch is in released position.

'25. In a road rolling machine, the combination with a vehicle frame, of a road roller connected 75 thereto, steering apparatus connected to said frame, an engine mounted on said frame, power transmission mechanism connected to said roller and comprising a reversing gearing, a manual lever mounted to be moved forwardly and rearwardly longitudinally of the machine, a clutch between the engine and the power transmission mechanism, mechanism comprising a rock shaft between said lever and said clutch for effecting the'application of the latter whether the lever is moved forwardly or rearwardly from its intermediate neutral position, and mechanism comprising a Y-actuator connected between said rock shaft and said reversing gearing to enable the swinging of said lever forwardly to eifect operationof the machine in one direction and the swinging of the lever in the opposite direction to effect reverse operation of the machine.

26. In a road roller, the combination with supporting framework, of a hitching device adapted to pivotally connect said frame-work to a hauling vehicle forlateral swinging movement relatively to the latter on the upright axis of said pivot,

steering apparatus at the rear end of said framework, a road roller adjustably supported on said framework, and non-road engaging means for moving the roller up ofi the roadway when the framework is hitched to said hauling vehicle and derives its sole support from the hauling vehicle and said steering apparatus, the construction and arrangement being such that when the roller engages the roadway it is operated by the hauling vehicle and controlled in its swinging movements on said pivot by said steering mechanism.

27. In a road roller, the combination with rectangular open main frame, of a rectangular subframe pivoted to said main frame to occupy positions within the same, a roller connected to said sub-frame, self-contained power-operated mechanism for driving said roller to propel the machine along the roadway, steering wheels for supporting one end of said main frame, steering mechanism connected to said wheels, and fluid-pressure motor mechanism between said frames for tilting the *sub-frame relatively to the main frame on the pivotal connection between the same.

RAYMOND w. KEELER. 

